Submission #978544

#	Time	Username	Problem	Language	Result	Execution time	Memory
978544		vjudge1	Passport (JOI23_passport)	C++17	0 / 100	86 ms	17056 KiB

passport

#include<bits/stdc++.h>
#define sz size()
#define ll long long
using namespace std;
const ll N = 3000;
const ll INF = N;

void solve()
{
    ll n, Q, i, j, k;
    cin >> n;

    ll l[n + 1], r[n + 1];
    for(i = 1; i <= n; ++i)
        cin >> l[i] >> r[i];

    cin >> Q;
    while(Q--)
    {
        ll start;
        cin >> start;
        ll cl = start, cr = start;

        vector<ll> d(n + 1, INF);
        d[start] = 0;
        multiset<pair<ll, ll>> q;
        q.insert({0, start});
        while(q.sz)
        {
            auto [x, s] = *q.begin();
            q.erase(q.find({x, s}));

            for(ll t = l[s]; t <= min(cl, s); ++t)
            {
                if(d[t] < x + 1) continue;
                q.erase({d[t], t});
                d[t] = x + 1;
                q.insert({d[t], t});
            }
            cl = min(cl, l[s]);
            for(ll t = max(s, cr); t <= r[s]; ++t)
            {
                if(d[t] < x + 1) continue;
                q.erase({d[t], t});
                d[t] = x + 1;
                q.insert({d[t], t});
            }
            cr = max(cr, r[s]);
        }
        ll ans = max(d[1], d[n]);
        cout << (ans < INF ? ans : -1) << '\n';
    }
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    solve();
}

Compilation message (stderr)

passport.cpp: In function 'void solve()':
passport.cpp:10:17: warning: unused variable 'j' [-Wunused-variable]
   10 |     ll n, Q, i, j, k;
      |                 ^
passport.cpp:10:20: warning: unused variable 'k' [-Wunused-variable]
   10 |     ll n, Q, i, j, k;
      |                    ^

• Subtask 1: 0 / 6
• Subtask 2: 0 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46